An introduction to the science & practice of photography (1895)
Jones, Henry Chapman, 1854- · London, Iliffe, Sons & Sturmey Ltd · leaf 137
the public at the Photographic Society in May, 1892, by Ross & Co., though its construction had been worked out by Dr. Schrceder about three years earlier. The uncemented surfaces of each com- bination are concentric, and the cemented surfaces are flat (see fig. 38). With an aperture of about f/22… … Fig. 38. definition, and the want of correction of this aberration is a weak point. But as there is no need to use a small aperture to gain defining power at the edges of the plate, this lens is often in practice more rapid than many that have a far larger maximum aperture. The distance apart of…
Photography
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